Fire-extinguishing cartridge shell



April 13 1926. 1,580,816

H. T. DUNN FIRE EXTINGUISHING CARTRIDGE 'SHELL Filed Jan. 18, 1924 Patented Apr. 13, 1926.

of the shell and explosive charge cap con-' N H l ,HUGH THOMAS DUNN, OF NEW YORK, N. Y.

FIBE-EXTINGUISHING CARTRIDGE SHELL.

Application filed January s, 1924. semi No. 687,076.

To all whom e't may concern: 1

Be it known that I, HUGH THOMAS DUNN, a citizen of the United States, and a resident of New York, inthe county and State of New York, have invented certain new and useful Improvements in Fire-Extinguishing Cartridge Shells, of which the following is a specification.

The present invention relates to improvements in fire extinguishing cartridge shells containing fire extinguishing elements,-that are propelled with the aid of an explosive charge in guns at fires for the purpose of extinguishing fires.

The figures in the drawings are elevations tainer with novel means of propulsion that will be described in the specifications and claims.

Figure 1, 1 the exterior shell casing. 2 the interior shell. 3 the shell head. 4 the interior shell cap projecting striker rod. 5 the orifice plugs in head cap. Figure 2, 6 the cap casing. 7 the cap base. Figure 3, 1 the exterior shell casing. 6 the cap casing. 7 the base. 8 the explosive charge. 6 the shell jacket. Figure 4, 1 the exterior shell casing. 6 the shell jacket. 9 the plane. 10 the bracket. '11 the plane struts. 12 the propulsive rod shank. 13 the support brace. 6 the explosive cap. 14; the propulsive gun. Figure 5, 3 the shell head. 4 the projecting striker rod. 5 the orifice plugs. 11 the plane struts. 9 the plane. 15 the vertical plane. 12 the propelling shank rod. Figure 6, 1 the casing cartridge shell. 3 the shell head. 4 the projecting striker rod. 5 the orifice plugs. 16 the shell jacket. 9 the lane. 11 the plane strut supports. 10 the racket. 12 the propellin shank. 14: the propulsive gun. 10 the bracket; 16 the universal joint. 17 the vertical support. 15 the vertical plane. 18 the base support.

Construction.

shell casing in recessed grooves in base and cap of the exteriorshell to hold them in; osition. The exterior shell is made of simi ar noncorrosive material of s herical form with a screw cap with thre on the connecting end of shell casing and on the conical caps interior edge to connect to the shell casing. The conical cap has central orifice. for the projecting rod to extend through and other orifices in the conical curve of the cap with plugs of the same material of construction. The space between the interior shell and interior casing is to be filled with water and bicarbonate of soda of strong solution. The interior of the cap is'sealed with wax and the cap screwed on and cemented with waterproof cement also the joint around the projecting rod in the central orifice. The shells are wrapped in cartridge paper around their base and areinsertedein brass caps holding a charge of exlosive owder. The shells are also inserted in meta jackets with brackets connecting to small planes'with connecting struts of metal, and a projecting propelling shank is connected to the shell and jacket with the projecting end of a round circular form to fit snu 1y into the barrel of guns to propel the shel with the projecting shank. Slight changes may be made in my invention without departing from the spirit or scope thereof.

' Operation.

The shells may be filled and charged with any fire extinguishing elements or materials and when made of small sizes they may be discharged into fires from ordinary guns and with guns of a special size barrel, and for larger sizes the propelling shank is inserted into the barrels of guns and the explosive chargedcap of powder or other explosive material is applied to the propelling shank and the connected planes will carry the shells over a greater distance from the explosive impulse applied to the projecting rod at forest and oil fires Where the intense heat prevents firemen from approaching near enough to extinguish them with their present apparatus, and also at fires Where no water is available the fire extin:

the shells are discharged into fires that will extinguish the fires. The plugged orifices in the head cap of the shell are to act as safety valves in case that the interior shell should be broken by accidental contact in handling the shells as the mixture of the sulphuric acid and Water forms carbonic gas the pressure in the interior of the shell will drive out the plugs and allow the carbonic gas to escape without damage or bursting of the shell, and also provides for manual operation by firemen who can push in the projecting rod breaking the interior shell and throwing the shells into fires where possible to do so.

A fire, extinguishing shell, comprising an outer casing and an inner breakable casing, each of which contain fireext1ngu1sh1ng elements, a jacket for the outer container, a

striker rod projecting from the inner casing, an apertured head for the outer casing, sa1d apertures containing the said striker rod and plugs and a plane to support said shell with propelling shank rod.

Having thus described my invention I herewith aflix my signature.

HUGH THOMAS 

